Adjustable shore



Patented Nov. 8, 1927.

UNITED STATES FRANK P. MAERK, OF CHIGAGO, ILIVJINOIS- ADJUSTABLE SHORE.

Application filed February 2, 1927. Serial No. 165,271.

My invention relates to improvements in adjustable shores for supporting temporary form work for concrete construction, and one of the important objects of my invention is the provision of such a shore having posi tive lifting and holding means to prevent giving or settling thereof when the load is placed on the shore.

Another object of myinvention is the provision of such an adjustable shore in which the exposed ends of the extensible members are constructed in such a manner as to protect the same from splitting or shearing from the feet of the shore.

Other objects and advantages of my invention will appearmore fully from the following description and the accompanying drawings in which similar characters of reference indicate similar parts throughout the several views.

Fig. 1 is an elevational view of a shore embodying my invention. partially broken away to show the mechanism.

Fig. 2 is a cross-sectional plan view on the 4 line 22 of Fig. 1.

Fig. 3 is a partial cross-sectional View on the line 33 of Fig. 1.

Fig. 4 is a plan view of the clamping; means employed in my invention, on the line 4-4- of Fig. 1, and on a reduced scale.

Fig. 5 is an elevational view of amodified form.

Fig. 6 is a cross-sectional view on the line e e of Fig. 5. I

Referring to Figs 1 to 3, 10 indicates in its entirety my adjustable shore, which is shown in combination with the stringers 1.1., planks 12 and mold pans 13, which are used for concrete forms in the usual concrete floor construction. I

The adjustable shore 10 comprises a pair of extensible members l land 15, preferably consisting of standard iron pipe sections, one of which is slidably received within the other. The lower pipe section15, which is preferably the smaller of the two, is provided with a flat foot 16, which may consist of a flat plate of metal having a substantially cylindrical boss 17 pressed outof its central part. the boss 17 being of a size ad apted to be received within the piping 15. may be secured to the pipe 15 by rivets 1.8, welding, or any convenient fastening means, and itwill be observed that the lower edge of the piping 15 rests flatly upon the plate 16 so that the weight upon the shore is not The boss 1.?

taken by the rivets, welds or other fastening means, thereby providing a foot structure which is stronger than the pipe itself. r

The upper extensible member 14 may like wise be provided with a flanged foot 19 of similar structure to the foot 16, but having a central tubular boss 20 of a larger diameter, adapted to fit within the interior of the pipe 14, and the foot and piping maybe fastened to each other by riveting, welding, or other convenient fastening means. If desired, it will: be found convenlent to secure these members together in the smaller sizes by means of threads within the piping and upon the exterior of the bosses 17 and 20.

. In order to support the extensible members 1 1 and 15 in fixed relation without any settling or give whatsoever, I provide clamping means in the form ofa plurality of clamping shoes 25 and 26, which may consist of cast metal members having their interior surface adapted to conform to the exterior surface of the piping 15 and to clamp the same.

The shoe 25 may be provided with an aperture 27 which is adapted to. receivethe bolt 28, having a threaded end 29, and the shoe 26 may be provided with a threaded aperture 30, which is adapted to receive the threaded end 29 ofthe bolt.' The bolt 28 32, the bolt will rotate freely within the bore 27, but the threaded end 29 will draw the shoe 26 toward the shoe 25, clamping the lower extensible member 15. The bolt 28 is preferably located on one side of the shoes I 25 and 26, while the opposite side of the shoes is provided with a similar bolt 33,

' having a. similar crank 34; and handle 35.

The interior surface of the shoes 25 and 26 is enlargedas at 36 after the manner of a counterbore, so as to receive the end of the exterior surface of the piping 15.

piping 14 which is larger than the piping 15, and to support the same upon the annular shoulder 37. Sufficient play must be pro vided between the shoes and the upper lateral surface of the piping 14 so that the shoes 25 and 26 may always clamp the piping 15. If desired, either one of the shoes 25 or 26 may be permanently afiixed to the upper piping 14 by welding, riveting or other fastening means. i

The lifting means employed in my invention comprises a pair of lateral frame members 38 and 39, whichmay consist of strong metal plates threaded together by a plural ity of rivets 40, passing through said plates, and an elongated partition 41 having a forward surface 42 which is adapted to fit the The partition 41 and plates 38 and 39 slidably support a rack 43 having the usual gear teeth 44, and the plates 38 and 39 support a stub shaft 45, which in turn pivotally supports the pinion 46, meshing with the teeth 44 of the rack 43.- i

The pinion 46 may be provided with an elongated handle 47 which may be cast integrally with said pinion and extending from one side thereof. The rack 43 may be provided with a dove-tailed channel 48 adapted to receive the dovetailed guide 49 upon the partition 41, and the upper end of the rack 43 is provided with a laterally extending lug 50 adapted to fit closely about half of the piping 15 below the shoes 25 and 26 and to support the shoes 25 and 26 during the lifting movement.

The supporting plate 38 may be extended beyond the supporting plate 39 to provide support for a pivotal post 51, which pivotally supports a cam shaped member 52 having a plurality of teeth upon the side toward the piping 15, said teeth having a substantially circular edge 53 for the purpose of better gripping the pipe 15. The cam 52 may be retained upon the post 51 by a cotter pin 54, and the cam should preferably be provided with a short handle 55 in such manner that when the handle 55 is pressed downwardly, the enlarged portion of the cam 52 comes in contact with the piping 15. It will also be observed that downward motion of the frame members 38, 39 and 41 caused by the reaction of the rack 43 upon the clamping shoes, will also tend to cause the enlarged section of the cam to more firmly grip the piping 15.

The method of operation of my invention is as follows: The lower shoe 16 may be supported directly upon the floor 59 or attached to a plank 57 by means of nails 58, and the upper section '14 having been attached to the stringers 11, the sections 14 and 15 may be held in fixed relation by means of the clamping members 25 and 26. When it is desired to adjust the length of the shore, the cam 52 may be rotated in a clockwise direction by means of the handle 55, thereby provldmg an enlarged aperture to receive the lower .pipe section 15, and the handle 47 having been lifted to its uppermost position, the lifting jack may be placed upon the lower section 15 with the lug 56 beneath the shoes 25 and 26. The handle 55 may then be rotated counter-clockwise, clamping the lifting jack upon the lower piping 15, and after releasing shoes 25 and 26 slightly by means of the handles 32 and 35, the operator may bear downward upon the handle 47 the pinion 46 actuating the rack 43 upward, engaging the shoes 25 and 26 and lifting the piping 14.

When the piping 14 has been lifted. to the desired position, aligning the stringers 11, the shore may be clamped in adjusted position by turning the cranks 31v and 34, and itwill be observed that when the lifting jack is removed from beneath the shoes 25 and 26, there will be no settling whatever, as in the case of clamping devices which are designed to be actuated by the weight of the supported structure itself. Furthern' ore, by application of the lifting force to. the clamping shoes 25 and 26 instead of to the upper member 14, I insure the absence of play between the lower edge of the piping 14 and the shoes and 26. 7

Referring to Figs. 5 and 6, I have here shown a modified form of my lifting jack, having a very simple and economical means for clamping the ack uponthe lower piping 15. In this modification the plates 38 and 39 may be of smaller area, both terminating at the edge of the frame member 41 to which ivets 40, as previously described. The interior surface 42 of the frame member 41 is preferably of the cross section shown in Fig. 6 so as to permit the ack to be removed by sliding downward, as shown in this figure, and the frame member 41 is provided with a pair of substantially U shaped hooks 56, one supported at each end of the frame member 41 in such manner as-to receive ing 15, as shown in Fig. 6.

The play between the frame member 41, hooks 56 and piping 15 should preferably be very small so that upon upward actuation of the rack 43 and downward reaction of the frame member 41, the hooks 56 will move to the position shown in Fig. 5 at a slight angle to the horizontal. It will be obvious that such movement would tend to the pipdecrease the distance between the outer legs of the hooks 56 and the frame member 41, thereby clamping the piping 15. The balexactly the same as that employed in Fig. 1.

It will thus be observed that I have invented improvements in shores having positive lifting and clamping means whereby there will be no settling or giving of the shore after a load is placed thereon.

While I have illustrated and described a specific embodiment of my invention, many modifications ma be made without departing from the spir1t of the invention, and I do not wish to be limited to the precise details set forth, but desire to avail myself of all changes within the scope of the appended claims.

Having thus described my invention, what I claim is new and desire to secure by Letters Patent of the United States is:

1. In a device of the class described, an extensible shore comprising two telescoping members, positive clamping means supporting one of said members to hold said members in fixed relation, a rack having a shoe supporting said clamping means, a frame for slidably supporting said rack, quick detachable gripping means for supporting said frame on the other of said members, and force multiplying means for actuating said rack.

2. In a device of the class described, an extensible shore comprising two telescoping members, positive clamping means supporting one of said members to hold said members in fixed relation, a rack having a shoe supporting said clamping means, a frame for slidably supporting said rack, quick detachable gripping means for supporting said frame on the other of said members, and force multiplying means for actuating said rack, comprising a pinion engaging said rack and a lever fixed to said pinion.

3. In a device of the class described, an extensible shore comprising two telescoping 1 members, a pair of screw actuated clamping shoes having substantially cylindrical surfaces to clamp the smaller of said telescoping members and shoulders to support the other of said members, a rack having a projecting lug for supporting said clamping shoes, a

frame for slidably supporting said rack, quick detachable gripping means for sup porting said frame on the smaller of said telescoping members, and force multiplying means for actuating said rack.

4. In a device of the class described, an,

extensible shore comprising two telescoping members, a pair of screw actuated clamping shoes having substantially cylindrical surfaces to clamp the smaller of said telescoping members, shoulders to support the other of said members, and a wall about the base of said other member, a rack having a projecting lug for supporting said clamping shoes, a frame for slidably supporting said rack, quick detachable gripping means for supporting said frame on the smaller of said telescoping members, and force multiplying means for actuating said rack.

5. In a device of the class described, an extensible shore comprising two telescoping members, a pair of screw actuated clamping shoes having substantially cylindrical surfaces to clamp the smaller of said telescoping members and shoulders to support the other of said members, pressed metal feet for each end of said shore comprising a flat plate having a tubular boss pressed therein to fit within said tubular members, a rack having a projecting lug for supporting said clamping shoes, a frame for slidably supporting said rack, quick detachable gripping means for supporting said frame on the smaller of said telescoping members, and force multiplying means for actuating said rack.

6. In a device of the class described, an extensible shore comprising two telescoping members, a pair of screw actuated clamping shoes having substantially cylindrical surfaces to clamp the smaller of said telescoping members and shoulders to support the other of said members. pressed metal feet for each end of said shore comprising a flat plate having a tubular boss press-ed therein to fit within said tubular members, an angle iron having a plurality of nail apertures in one side and having its other side fixed to the upper one of said pressed metal feet, a rack having a projecting lug for supporting said clamping shoes, a frame for slidably supporting said rack, quick detachable gripping means for supporting said frame on the smaller of said telescoping members, and force multiplying means for actuating said rack.

In witness whereof, I hereunto subscribe my name this 29th day of January, 1927.

FRANK P. MAERK. 

